Abstract: One cable compensation circuit is connected to a shunt regulator to generate a feedback voltage corresponding to an output voltage of a power supply device. The cable compensation circuit controls cathode impedance of the shunt regulator according to the output current of the power supply device to compensate a voltage drop generated in a cable.

Abstract: One cable compensation circuit is connected to a shunt regulator to generate a feedback voltage corresponding to an output voltage of a power supply device. The cable compensation circuit controls cathode impedance of the shunt regulator according to the output current of the power supply device to compensate a voltage drop generated in a cable.

Abstract: A controller of a power converter is provided. The controller includes a feedback circuit, an output circuit, and a clamping circuit. The feedback circuit generates a feedback signal in accordance with output of the power converter. The output circuit generates a switching signal in accordance with the feedback signal for regulating the output of the power converter. The clamping circuit limits the feedback signal under a first level for a first load condition and limits the feedback signal under a second level for a second load condition. The clamping circuit includes a timer circuit. The timer circuit determines a slew rate of the feedback signal for increasing the feedback signal from the first level to the second level, and the second level is higher than the first level.

Abstract: Disclosed is a switching mode power supply that includes: a power supply section including a main switch coupled to the primary winding of a transformer, wherein the main switch in normal operation mode performs a switching operation at a predetermined duty, wherein the main switch in standby mode does not perform a switching operation during a first interval and performs a switching operation during a second interval at a first duty, thereby supplying power to the secondary winding of the transformer; a mode discriminator for sensing the reception of an external sync signal at the primary winding of the transformer and generating a signal for operating the main switch in normal operation mode or in standby mode according to whether or not the external sync signal is received; a control voltage generator having a first transistor to which a current corresponding to a signal output from the mode discriminator flows, and a first capacitor connected in parallel to the first transistor; and a switching controller

Abstract: Disclosed is a switching mode power supply that includes: a power supply section including a main switch coupled to the primary winding of a transformer, wherein the main switch in normal operation mode performs a switching operation at a predetermined duty, wherein the main switch in standby mode does not perform a switching operation during a first interval and performs a switching operation during a second interval at a first duty, thereby supplying power to the secondary winding of the transformer; a mode discriminator for sensing the reception of an external sync signal at the primary winding of the transformer and generating a signal for operating the main switch in normal operation mode or in standby mode according to whether or not the external sync signal is received; a control voltage generator having a first transistor to which a current corresponding to a signal output from the mode discriminator flows, and a first capacitor connected in parallel to the first transistor; and a switching controller